Dewey: I want you to know something. I've been sleeping in that bed by myself for a week. A week without sharing covers, a week without being smashed, and a week without having anyone's butt shoved into my face.
Hal: So, what are you angry about?
Dewey: Because during the last week, I've grown half an inch. You lied to me. I'm not the smallest kid in my class from my genetics. It's because I've been stuffed into a bed with Malcolm all my life.
Hal: Whoo, you don't know that. It could be all the crap we feed you, or the chemical plant near the park.
Dewey: Dad!
Hal: Dewey, I'm sorry. But we can't afford to buy you your own bed. You'll just have to grow after Malcolm goes off to college. Oh, no, then Jamie's going into it. Well, at least you'll always be bigger than he is.